KR100753001B1 - Method for manufacturing heat strengthened glass of display device - Google Patents

Abstract

A method for manufacturing semi-reinforced glass for a display device is provided to obtain a low-weight and thin glass panel, and to allow slimness of a glass panel of 2mm or less. A method for manufacturing semi-reinforced glass for a display device comprises the steps of: dividing the inner part of the heating zone of a furnace(10) into several grid-like regions, including a center region, left region and right region in the transverse direction and at least four regions in the longitudinal direction; disposing blowers(30) on the top and bottom of the furnace for circulating the air inside the furnace and providing an air supply nozzle(40) in the heating zone; and heating semi-reinforced glass in the heating zone by atomizing the air to the top and the bottom of the furnace in such a manner that at least nine regions defined in the heating zone in the longitudinal direction are subjected to air atomization in a different amount of air, while controlling the temperature of each region individually.

Description

Method for manufacturing heat strengthened glass of display device

1 is a block diagram showing a method of manufacturing a semi-tempered glass for a typical display device

Figure 2 is a side schematic view showing an embodiment of an apparatus for implementing a method of manufacturing a semi-tempered glass for display device according to the present invention

3 is a plan view schematically illustrating a division of the heating zone of the furnace according to FIG. 2;

<Explanation of symbols for main parts of drawing>

10: furnace 20: heater

30: blower 40: nozzle

50: conveyor 60: glass panel

The present invention relates to a method for manufacturing semi-tempered glass used in a display device such as a PDP, LCD, etc. More specifically, a new method of improving the mechanical properties of the glass by individually controlling the temperature control for each zone in the heating zone By constructing the strengthening process, it is possible to manufacture lightweight and thin semi-toughened glass having excellent mechanical properties, thereby increasing the price competition rate of the product and manufacturing the semi-toughened glass for display device that can realize the slimming of the product. It is about.

At present, the components and devices related to optoelectronics have been remarkably advanced and spread in relation to the high information society of society.

Among them, display devices are remarkably widely used for televisions, personal computers, and the like, and thinner and larger sizes are desired.

Plasma displays have attracted attention as large, thin display devices.

In the manufacturing field of flat panel display devices such as thin film transistor-liquid crystal display (TFT-LCD), plasma display panel (PDP), and electro luminescent (EL), silica (SiO2) is used as an insulating film on the surface of a flat glass panel. An ITO (Indium tin oxide) film is coated with the film and the conductive film to be used in the manufacture of flat panel displays.

Usually in the case of such glass panels, for example, semi-tempered glass for PDP filters, as shown in Fig. 1, raw material import inspection → cutting → chamfering → cleaning → primary inspection → printing → strengthening → cleaning → final inspection → packaging Manufactured through → shipment inspection → shipment process.

In parallel with the enlargement of glass panels, many studies have been actively conducted to reduce the thickness and weight of the glass panels, and reinforcement methods have been developed to compensate for the structural weakness caused by the reduction and the reduction of the glass panels. .

The glass panel strengthening method is a physical strengthening method of forming a compressive stress layer on the surface of the glass panel by thermal strengthening and a chemical strengthening method of forming a compressive stress layer on the surface of the glass panel by ion exchange treatment. There is a chemical strengthening method.

The glass panel reinforcing process is usually performed in a heating zone in the form of a chamber, and adopts a method of heating with a heater in the upper and lower portions of the glass panel along the roll conveyor.

However, the existing glass panel reinforcement method has a problem of non-uniformity of the overall temperature distribution in the heating zone, a problem of breakage due to thermal stress in the heating zone, and a large temperature difference between the surface and the inside of the glass panel. It is not suitable for thin glass panels due to difficult problems, etc., but also involves a problem of making a large size glass panel difficult.

Due to the above manufacturing limitations (restrictions on the strengthening process), PDP semi-toughened glass usually has a thickness of about 2.5 to 5 mm, and is currently used to reduce the cost and weight of the glass panel and to reduce the cost. Research into a technology that reduces the thickness to 2.5mm or less is being actively conducted.

Therefore, the present invention has been made to solve the various problems of the prior art as described above, the object of the present invention is a glass panel through a new method of strengthening process to individually control the temperature control for each zone in the heating zone It can be manufactured by reducing the weight and thickness, and ultimately, the thickness of the glass panel can be made thinner than 2mm. have.

The present invention for achieving the above object in the semi-tempered glass manufacturing method for a display device comprising the step of heating the heater with respect to the semi-tempered glass via the inside of the heating zone, the inside of the heating zone in the width direction and length The area is divided in the direction, but the center area in the width direction, the left area and the light area on both sides are divided, and at least four areas are equally divided in the longitudinal direction to form an area arranged in a grid shape. Individually controlling the temperature control for the partitioned region of the characterized in that it comprises the step of heating the semi-tempered glass via the interior of the heating zone.

In addition, each region in the heating zone is characterized in that it comprises a step of individually controlling the temperature control for each partitioned region of the upper and lower parts so that the upper and lower parts are symmetrically partitioned with respect to the semi-tempered glass.

In addition, the individual temperature control for each partitioned area is applied to, subtracted, or maintained for each area in the width direction and each area in the longitudinal direction at this reference setting temperature based on the total setting temperature in the heating zone. It is characterized by controlling in the form.

The method may further include injecting air into the upper and lower portions of the heating zone, dividing the air into at least nine equal regions along the longitudinal direction of the heating zone, and differentiating and spraying the amount of air for each divided region. It is characterized by.

In addition, the amount of air differentially injected for each partitioned area is gradually reduced toward the rear in the longitudinal direction of the upper portion, it is characterized in that the form of gradually increasing in the lower portion.

In addition, by arranging a blower communicating the front and rear sides of the heating zone by pipes on the upper and lower portions of the furnace, respectively, it is possible to individually blow the upper and lower parts and to circulate air in the heating zone of the furnace to heat the temperature inside the heating zone. It is characterized in that the uniformity.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the semi-tempered glass manufacturing method for a display device according to the present invention will be described in detail.

The reinforcing process of the display apparatus, for example, a glass panel for a PDP, is performed by heating a heater to semi-toughened glass via the inside of the heating zone along a conveying means such as a roller conveyor.

At this time, the strengthening process is carried out for the glass panel cut and printed to the designed appropriate standard, and after the strengthening process is completed, the process of performing the cleaning process while spraying water and cooling immediately.

To this end, the heating zone for the reinforcement process involves a cleaning zone that continues continuously behind the progress line.

The heating zone is a chamber that serves as a kind of heating furnace (加熱爐), and usually has a volume in the form of a square frame structure, a plurality of heater means is provided inside.

The present invention partitions the inside of the heating zone into a predetermined area shape, and provides a new concept of reinforcing process of individually controlling the temperature control for each of the divided areas.

In this case, the partition is not meant to physically block the inner space of the furnace, but to divide the space inside the furnace into a virtual boundary line.

In other words, it is a concept of controlling the temperature control independently for each area divided by the concept of collectively controlling the temperature control in the furnace as before. Such individual temperature control control method for each area has a thin thickness and a large area. It is possible to provide the optimum reinforcement treatment conditions for the glass panel having a.

For the individual temperature control control for each region as shown in FIGS. 2 and 3, a heater 20 is installed in each partitioned region inside the furnace 10, and the heater 20 at this time is a furnace ( It is arranged at the top and the bottom of 10, respectively, to enable individual temperature control control between the upper and lower regions.

In addition, a blower 30 capable of circulating air in the furnace 10 to uniformly form the entire air atmosphere in the furnace in parallel with the individual temperature control control for each region through the control of the heater 20 and A plurality of nozzles 40 are provided to blow air.

At this time, the blowers 30 are respectively disposed on the upper and lower portions of the furnace 10, and the front and rear sides of the heating zone are connected to each other by pipes, so that individual blowers for the upper and lower portions of the furnace 10 are possible. It will cycle up and down. Accordingly, the overall temperature inside the furnace 10 may be formed more uniformly.

In addition, in the case of the nozzle 40, at least one of the nozzles 40 is provided in a form in which the nozzles are partitioned in the longitudinal direction of the furnace 10.

Here, reference numeral 50 denotes a conveyor, and 60 denotes a glass panel.

Looking at the semi-tempered glass manufacturing method provided by the present invention in more detail as follows.

The semi-tempered glass manufacturing method of the present invention basically includes a process of heating the heater with respect to the semi-tempered glass via the inside of the heating zone.

First, the area is partitioned inside the heating zone in the width and length directions.

For example, the entire area (area) of the heating zone is divided into the center area C in the width direction, the left L area and the light R area on both sides, and at least four areas in the length direction. By dividing it equally, the area | region arrange | positioned in a grid | lattice form is formed.

That is, a total of 12 partitioned regions arranged in a grid form are partitioned into three regions in the width direction and four regions in the longitudinal direction. 2 and 3 denotes a dividing line.

The number of regions at this time is only one example and can be divided into various subdivided forms.

The heaters are assigned to each of the zones thus partitioned, and the heaters for each zone can be individually controlled.

In addition, the partitions for each region in the heating zone as described above may be partitioned in a form symmetrical with each other on the top and bottom.

That is, a total of twelve partitioned regions having a lattice shape may be equally formed at the top and the bottom.

Here, the upper part and the lower part mean spaces above and below the line on which the semi-tempered glass is advanced.

Accordingly, the inside of the heating zone has 12 partitioned regions respectively formed at the top and the bottom of the semi-tempered glass on the basis of the traveling path of the semi-toughened glass, and the temperature control for each of the partitioned regions is controlled individually.

On the other hand, the individual temperature control for each partitioned area as described above, after setting the total temperature in the heating zone, the predetermined temperature at the reference setting temperature for each region in the width direction and the longitudinal direction based on the set temperature at this time height Control may be in the form of (adding), lowering (decreasing), or maintaining (keeping at the reference set temperature).

For example, the reference setting temperature of the entire upper area of the heating zone is set to 655 ° C, and the reference setting temperature of the entire lower area is set to 660 ° C.

At this time, the setting temperature may vary depending on the size, thickness, etc. of the glass, and may be operated up to about 600 to 700 ° C.

In this state of setting the reference setting temperature for the upper and lower regions, the temperature control is individually controlled for each partitioned region.

At this time, the temperature control control is performed by controlling the temperature of the heaters (100 to 120 or so heaters are provided in the heating zone as a whole, which are divided and assigned to each partitioned heating zone). The temperature detection of each area may be applied to the sensor means or the like.

Here, the method of controlling the temperature of the heater based on the detected value of the sensor means or the like can be adopted without particular limitation as long as it is a method commonly known in the art.

For example, in the case of each partitioned area at the top during the tempering process for semi-toughened glass with a glass panel thickness of 2 mm, the left area is 0 (655 ° C), -3 (652) from the front of the heating zone toward the longitudinal direction. ° C), 0 (655 ° C), 0 (655 ° C), 0 (655 ° C), and the center area is -1 (654 ° C), -1 (654 ° C), 3 (658 ° C), 0 (655) ℃), and the light area is controlled by increasing or decreasing to 1 (656 ℃), -1 (654 ℃), 3 (658 ℃), 0 (655 ℃).

Similarly, for each of the lower compartments, the left area is controlled to 14 (674 ° C), 14 (674 ° C), 1 (661 ° C), and 1 (661 ° C), and the center area is 17 (677 ° C). , 16 (676 ℃), -3 (657 ℃), -1 (659 ℃), light area 15 (675 ℃), 16 (676 ℃), -7 (653 ℃), -1 (659) ℃).

Other conditions for individual temperature control in each of these areas are as follows.

The time for the glass panel to pass through the heating zone is preferably about 127 seconds (sec), but at this time, the glass panel may be changed to about 100 to 210 seconds depending on the glass size and thickness, and the conveying speed of the conveyor is about 550 mm / s. .

On the other hand, the present invention provides air into the heating zone in parallel with the manner of controlling the individual temperature control for each partitioned area as described above.

At this time, the reason for providing air is to minimize the temperature difference between the heating zone and each zone by supplying hot air because the temperature difference is generated for each heating zone and zone when the heat is controlled only by heating.

To this end, the inside of the heating zone is divided into at least nine equal regions along its longitudinal direction, and the amount of air is differentiated and sprayed for each divided region.

The nine compartments above are formed at the top and bottom of the heating zone, respectively. Accordingly, reference numeral P2 of FIGS. 2 and 3 denotes a line representing nine areas divided.

At this time, the differentiated form of air injection is the form of the air decreases gradually toward the rear in the longitudinal direction in the upper portion, the form of air increases gradually in the lower portion.

For example, assuming a blower capacity of 100%, for each compartment in the upper section, 70%, 65%, 65%, 50%, 50%, 45%, 30% from front to back of the heating zone , 20%, 20%, and reduced air supply, and in the lower compartment, 10%, 20%, 40%, 60%, 60%, 70%, 80%, 80%, 80% and Increase air supply as

Therefore, as a result of testing the mechanical properties of the glass panel (thickness 2mm) manufactured by the individual temperature control control for each area as described above, it can be seen that the stress significantly exceeds the reference value 25, 35,47 (MPa), It can be seen that the degree of warpage is 0.047%, which shows an excellent flatness compared to the standard value of 0.1%, and in addition to this, it can be seen that the mechanical properties are excellent in terms of squareness and fracture strength.

As described above, the present invention can implement an optimal reinforcing process suitable for thin glass panels and large size glass panels by controlling the temperature control for each zone within the heating zone during the reinforcing process for semi-toughened glass. By providing a new concept of semi-tempered glass manufacturing method, the glass panel can be made thinner by 2mm or less, making it possible to reduce the weight and thickness of the glass panel. have.

Claims (6)

In the semi-tempered glass manufacturing method for a display device comprising the step of heating with a heater to the semi-tempered glass via the inside of the heating zone of the furnace, The heating zone of the furnace is partitioned in the width direction and the longitudinal direction, but divided into the center area in the width direction, the left and the left area and the light area in the width direction, and at the same time divided into at least four areas in the longitudinal direction. A region arranged in a lattice form is formed, and an internal air circulation blower is disposed at the upper and lower portions of the furnace, and an air supply nozzle is provided inside the heating zone to provide air to the upper and lower portions of the heating zone of the furnace. Spraying, but partitioning into at least nine equal areas along the longitudinal direction of the heating zone, differentiating and spraying the air volume for each partitioned area, and individually controlling the temperature control for each partitioned area Semi-tempered glass manufacturing method for a display device comprising the step of heating the semi-tempered glass via. The method of claim 1, wherein the heating zone of the furnace comprises the step of individually controlling the temperature control for each partitioned area of the upper and lower parts by symmetrically partitioning the top and bottom with respect to the semi-tempered glass. Semi-tempered glass manufacturing method for a display device, characterized in that. The method according to claim 1 or 2, wherein the individual temperature control for each of the partitioned areas is applied to each area in the width direction and each area in the longitudinal direction at this reference setting temperature based on the total setting temperature in the heating zone, or Semi-tempered glass manufacturing method for a display device, characterized in that the control to reduce or reduce the shape. delete The semi-tempered glass for display device according to claim 1, wherein the amount of differently injected air for each of the partitioned areas is gradually decreased toward the rear in the longitudinal direction of the upper part, and gradually increases in the lower part of the upper part. Manufacturing method. The method according to any one of claims 1 and 2, Arranged blowers communicating the front and rear sides of the heating zone by pipes at the upper and lower portions of the furnace, respectively, enable individual blowing to the upper and lower portions, and circulate the air in the heating zone of the furnace to uniform the temperature inside the heating zone. Semi-tempered glass manufacturing method for a display device, characterized in that.

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